Study on Preparation and Properties of High⁃strength Polypropylene⁃matrix Composites

doi:10.19491/j.issn.1001-9278.2021.02.001

Abstract

Abstract:

A type of copolymer polypropylene （coPP）/isotactic polypropylene （iPP） self?reinforced wire material was prepared by composite extrusion and die drawing. A high-strength all-polypropylene composite sheet was prepared via hot-pressing with this wire material as a reinforcement and coPP as a matrix， and its mechanical properties， dynamic mecha?nical properties， and recyclability were investigated. The results indicated that the tensile strength and bending strength of the composite sheet reached 160 MPa and 63 MPa， respectively. The addition of the reinforcement greatly improved the energy storage modulus of the composite sheet but reduced its loss factor；A recycled sheet was obtained through pulverizing， granulating and hot?pressing with 25 wt% of reinforced composite board. Its tensile strength decreased by only 7.3 %， and there was almost no loss in its bending strength. The internal coPP and iPP had good compatibility， indicating good recyclability of the composite sheet.

Key words: polypropylene?matrix composite, self?reinforced composite wire, full recyclability

CLC Number:

TQ325.1⁺4

LI Wenchao, ZENG Jia, CHEN Chenghong, ZHOU Liuliu, WU Shijian. Study on Preparation and Properties of High⁃strength Polypropylene⁃matrix Composites[J]. China Plastics, 2021, 35(2): 1-7.

Figures/Tables 14

Fig.1. Schematic diagram of co?extrusion

Fig.2. Polarizing microscope photo of the cross section of the composite billet

单螺杆

挤出机

一段

温度/℃

二段

温度/℃

三段

温度/℃

四段

温度/℃

五段

温度/℃

转速/

r·min^-1

Tab.1. Processing parameters of the single screw extruder

Fig.3. Schematic diagram of hot compaction of all?polypropylene composite sheet

Fig.4. Variation of weft mechanical properties of 25 % iPP reinforced composite sheet with pressure and temperature

Fig.5. Variation of weft shrinkage percentage of 25 % iPP reinforced composite sheet with pressure and temperature

Fig.6. The density and weft shrinkage of all polypropylene composites

Fig.7. Comparison of mechanical properties of all?polypropylene composite sheet with different reinforcement contents

Fig.8. 2D?WAXD patterns of composite billet and self?reinforced wire

Fig.9. Optical microscope photo of the cross section of 25 % iPP reinforced composite sheet

Fig.10. Variation of storage modulus of 25 % iPP reinforced composite sheet and coPP sheet with testing temperature

Fig.11. Variation of loss factor of 25 % iPP reinforced composite sheet and coPP sheet with testing temperature

板材类型	拉伸强度/MPa	弯曲强度/MPa
25 %iPP增强体回收板材	21.7	29.4
25 %iPP共混板材	23.4	29.8

Tab.2. Mechanical properties of 25 % iPP reinforced recycled sheet and 25 % iPP blended sheet

Fig.12. DSC curves of different materials

References 19

1	ETCHEVERRY M， BARBOSA S E. Glass Fiber Reinforced Polypropylene Mechanical Properties Enhancement by Adhesion Improvement［J］. Materials， 2012， 5（12）：1 084⁃1 113.
2	YOO Y， SPENCER M W， PAUL D R. Morphology and Mechanical Properties of Glass Fiber Reinforced Nylon 6 Nanocomposites ［J］. Polymer， 2011， 52（1）： 180⁃190.
3	LUBINEAU G， RAHAMAN A. A Review of Strategies for Improving the Degradation Properties of Laminated Continuous⁃fiber/epoxy Composites with Carbon⁃based Nanoreinforcements ［J］. Carbon， 2012， 50（7）： 2 377⁃2 395.
4	TANG L G， KAROOS J L. A Review of Methods for Improving the Interfacial Adhesion between Carbon Fiber and Polymer Matrix［J］. Polymer Composites， 1997， 18（1）：100⁃113.
5	IGAWA N， TAGUCHI T， YAMADA R， et al. Mecha⁃nical Properties of SiC/SiC Composite with Magnesium–silicon Oxide Interphase［J］. Journal of Nuclear Materials， 2007， 367（4）：725⁃729.
6	BRENDEL A， POPESCU C， SCHURMANN H， et al. Interface Modification of SiC⁃Fibre/Copper Matrix Composites by Applying a Titanium Interlayer［J］. Surface and Coatings Technology， 2005， 200（1/2/3/4）：161⁃164.
7	ALCOCK B， PEIJS T. Technology and Development of Self⁃Reinforced Polymer Composites［M］//Polymer Composites⁃Polyolefin Fractionation⁃Polymeric Peptidomimetics⁃Collagens. Berlin， Heidelberg： Springer Berlin Heidelberg， 2011： 1⁃76.
8	HINE P J， WARD I M， JORDAN N D， et al. The Hot Compaction Behaviour of Woven Oriented Polypropylene Fibres and Tapes. I. Mechanical Properties［J］. Polymer， 2003， 44（4）：1 117⁃1 131.
9	JORDAN N D， BASSETT D C， OLLEY R H， et al. The Hot Compaction Behaviour of Woven Oriented Polypropylene Fibres and Tapes. II. Morphology of Cloths before and after Compaction［J］. Polymer， 2003， 44（4）：1 133⁃1 143.
10	刘科，刘义，曾佳，等. 超轻高强聚丙烯/碳酸钙线材研究［J］. 塑料工业， 2019， 47（2）：48⁃51.
	LIU K， LIU Y， ZENG J， et al. Properties Study of Ultra⁃Low Density and High⁃Strength Polypropylene/CaCO₃ Wires［J］. China Plastics Industry， 2019， 47（2）：48⁃51.
11	公艳艳，谭洪生，谭哲兴. 口模拉伸高取向抗冲共聚聚丙烯的研究［J］. 塑料科技， 2015， 43（3）：50⁃54.
	GONG Y Y， TAN H S， TAN Z X. Research on Highly Oriented Impact Polypropylene Copolymer by Die⁃Drawing Process［J］. Plastics Science and Technology， 2015， 43（3）：50⁃54.
12	R.S.戴夫（Raju S.Dave）， A.C.卢斯（Alfred C.Loos）编. 方征平，沈烈译. 高分子复合材料加工工程［M］.北京：化学工业出版社， 2004： 242⁃246.
13	ALCOCK B， CABRERA N O， BARKOULA N M， et al. Direct Forming of All-Polypropylene Composites Products from Fabrics Made of Co-Extruded Tapes［J］. Applied Composite Materials， 2009， 16（2）：117⁃134.
14	ABRAHAM T N， SIENGCHIN S， KARGER-KOCSIS J. Dynamic Mechanical Thermal Analysis of All-PP Composites Based on β and α Polymorphic Forms［J］. Journal of Materials Science， 2008， 43（10）：3 697⁃3 703.
15	ALCOCK B. Single Polymer Composites Based on Polypropylene ： Processing and Properties ［M］. Queen Mary University of London， 2004：75⁃111.
16	BOYD R H. Relaxation Processes in Crystalline Polymers： Experimental Behaviour—A Review［J］. Polymer， 1985， 26（3）：323⁃347.
17	HU W G ， SCHMIDT R K. Polymer Ultradrawability： The Crucial Role of A-relaxation Chain Mobility in the Erystallites［J］. Acta Polymerica， 1999， 50（8）：271⁃285.
18	ROY S K， KYU T， MANLEY R S J. Mechanical Relaxations of Oriented Gelation-crystallized Polyethylene Films ［J］. Macromolecules， 2002， 21（6）： 1 741⁃1 746.
19	KALLAYMENYHARD A， VARGA J， LIBER á， et al. Polymer Blends Based on the Beta-modification of Polypropylen［J］. European Polymer Journal， 2005， 41（4）：669⁃677.

[1]	YU Changyong, XIN Zhong. Effect of α/β complex nucleating agent based on hexahydrophthalate on properties of polypropylene [J]. China Plastics, 2022, 36(7): 121-128.
[2]	LIU Yi, SUN Wei, QU Guoxing, WANG Ye, YUAN Ning, YANG Shaolin, XU Xia, CHANG Xiaoyi, ZHANG Yufei. Structure and performance analysis of transparent polypropylene special material for thin⁃wall injection molding [J]. China Plastics, 2022, 36(7): 37-43.
[3]	SUN Wei, LIU Yi, LIAO Yunlong, CHEN Junjia. Study on influence factors for determination of ethylene content in polypropylene powder [J]. China Plastics, 2022, 36(6): 54-59.
[4]	LI Jie, XU Ran, REN Feng, YANG Yifei, XIN Chunling, HE Yadong. Fiber fracture of continuous glass fiber⁃reinforced polypropylene prepreg tapes during melt impregnation [J]. China Plastics, 2022, 36(6): 69-76.
[5]	WANG Qingsong. Development of glass⁃fiber⁃reinforced polypropylene with high strength and low VOC [J]. China Plastics, 2022, 36(4): 30-34.
[6]	WANG Fuyu, GUO Jinqiang, ZHANG Yuxia. In⁃situ fibrillation methods of polymer blends and their application in PP⁃based blends [J]. China Plastics, 2022, 36(3): 146-156.
[7]	LI Qiwei, WANG Cuicui, ZHENG Haijun, CHEN Jihe, WANG Ge, CHENG Haitao. Effects of multiple extrusions on mechanical and foaming properties of polypropylene/bamboo fiber composites [J]. China Plastics, 2022, 36(2): 56-60.
[8]	JIAO Qi, LI Ruilong, CHEN Couxi, ZHANG Shouyu, SONG Chengpeng, CHEN Tonghai, JIANG Ruyuan, ZHENG Pengcheng. Lifetime predication of coal⁃based polypropylene modified with ternary antioxidant composite system [J]. China Plastics, 2022, 36(1): 15-24.
[9]	ZHU Nenggui, SHEN Chao, LI Shengnan, ZENG Xiangbu, JIANG Tuanhui, ZHANG Xiang. Study on preparation and foaming properties of polypropylene/fly ash micro foaming composites [J]. China Plastics, 2022, 36(1): 78-83.
[10]	ZHENG Pengcheng, LI Ruilong, CHEN Couxi, ZHANG Shouyu, JIANG Ruyuan, CHEN Tonghai, SONG Chengpeng, JIAO Qi. Design and application of new ternary composite antioxidant system for coal⁃based polypropylene [J]. China Plastics, 2021, 35(12): 1-8.
[11]	WANG Wenchao, WANG Yanzhi, ZHANG Zhenli, ZHANG Juliang, LIU Shaolei, WEI Bing. Toughening modification of polypropylene with β⁃nucleating agent for application in filter plates [J]. China Plastics, 2021, 35(12): 102-107.
[12]	HAN Xianxin, LIU Xijun, WANG Yuwei. Preparation and performance of PP/EPR/modified cellulose composite [J]. China Plastics, 2021, 35(12): 37-44.
[13]	LIU Xiaorui, ZHAO Feng, WANG Xiumei, GUO Wei, MAO Huajie, YAN Hongxu, DENG Jingwen. Study on non⁃isothermal stretch forming quality of continuous glass⁃fiber⁃reinforced polypropylene laminates [J]. China Plastics, 2021, 35(12): 58-62.
[14]	CHEN Shiqi, WANG Xuanlun. Preparation and Properties of Polypropylene Random Copolymer/Nano⁃SiO₂ Composites [J]. China Plastics, 2021, 35(10): 56-59.
[15]	MENG Xin, FAN Min, TONG Chuangchuang, LI Chao, GAO Jin, XIN Zhong. Effect of Zeolite⁃loaded Organophosphate Nucleation System on Properties of Polypropylene [J]. China Plastics, 2021, 35(9): 95-102.